MCQs of Motion of Fluid Particles and Streams (Fluid Mechanics and Hydraulic Machines - 3141906)

Showing 31 to 40 out of 42 Questions

31.

φ = x^{2} - y^{2}

is the velocity potential function in a 2-D flow field, then the magnitude of the velocity vector at point (1,1) would be

32.

Existence of velocity potential function implies that the flow is

33.

A 1-dimensional flow is one which

(a)	is uniform flow
(b)	is a steady uniform flow
(c)	takes place in straight lines
(d)	involves zero transverse components of flow

34.

A stream line and an equipotential line in a flow field are

35.

The continuity equation

\frac{\partial u}{\partial x} + \frac{\partial v}{\partial y} + \frac{\partial w}{\partial z} = 0

is valid for

(a)	ideal fluid flow only
(b)	incompressible fluids, whether the flow is steady or unsteady
(c)	steady flow, whether the fluid is compressible or incompressible
(d)	incompressible fluids and steady flow only

36.

For the flow of an incompressible fluid, the velocity component in the x-direction is

u = a x^{2} + b y

and the velocity component in the z-direction is zero. The velocity component in the y-direction would be

37.

Which of the following is not a correct statement?

(a)	Vorticity in a fluid motion numerically equals twice the value of rotation.
(b)	For irrotational flow, the curl of the velocity vector is zero.
(c)	Circulation is the line integral of the tangential component of velocity taken around a closed contour.
(d)	Circulation per unit area equals the vorticity in flow.

38.

The relation

(\frac{\partial^{2} ϕ}{\partial x^{2}} + \frac{\partial^{2} ϕ}{\partial y^{2}}) = 0

for an irrotational flow is referred to as

39.

A 2-D flow field is described by the velocity components

u = 2 x

and

v = - 2 y

. The corresponding velocity potential function would be

40.

The flow in a pipe is laminar when Reynold number is

Showing 31 to 40 out of 42 Questions